Nefarious Plot

Flashback {2}{U}{U} As an additional cost to cast this spell, sacrifice a creature with converted mana cost 3 or greater. Choose 1: You may return any number of land cards from you graveyard and exile this turn, they enter tapped. You may search your library for a land card for each mana in the sacrificed creatures converted mana cost, you may then put them into your graveyard.